[BUGFIX] Fix paths to AJAX urls of Dashboard

Corrected way of accessing the AJAX urls by
using the dot notation.

Resolves: #91113
Releases: master
Change-Id: I6c3fd48707f3d45c5432ac1e11f77b0c33d577ec
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64232


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>